Preparation of nitrogen-doped macro-/mesoporous carbon foams as electrode material for supercapacitors
Preparation of nitrogen-doped macro-/mesoporous carbon foams as electrode material for supercapacitors
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氮掺杂大孔/介孔碳泡沫超级电容器电极材料的制备
DOI：
10.1016/j.colsurfa.2012.06.042
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发表时间：
2012-10
期刊：
影响因子：
--
通讯作者：
Longwu Chen
中科院分区：
文献类型：
--
作者：
Wei Xiong;Mingxian Liu;Lihua Gan;Yaokang Lv;Zijie Xu;Zhixian Hao;Longwu Chen
制备了Span 80 -吐温80/1液体石蜡/间苯二酚-甲醛水包油（O/W）乳液体系。以氮掺杂大/中孔泡沫碳为原料，经炭化和活化制备了氮掺杂大/中孔泡沫碳（N-MMCFs）。通过扫描电镜、红外光谱、n2吸附和解吸分析以及电化学工作站对制备的N-MMCFs进行了表征。结果表明：N-MMCFs的主大孔为0.2μm，中孔为2.6 ~ 4.0nm，比表面积为1205 ~ 1808m2g−1；N-MMCFs与水的接触角约为37.5°，明显低于MMCFs的72.9°，这表明N-MMCFs的表面润湿性因氮进入碳框架而大大提高。电化学测量结果表明，当电流密度为1.0Ag−1时，典型的N-MMCF电极材料在6M KOH水溶液中的比电容高达198Fg−1。在20.0Ag−1的高负载电流密度下，其比电容仍然保持在159Fg−1，保持率为80.3%，表明典型的N-MMCF作为电极材料具有良好的倍率性能。大电流充放电能力为N-MMCFs作为满足高功率密度要求的超级电容器电极材料提供了广阔的应用前景。
An oil-in-water (O/W) emulsion system of Span 80–Tween 80/1iquid paraffin/aqueous resorcinol–formaldehyde was manufactured. Nitrogen-doped macro-/mesoporous carbon foams (N-MMCFs) were prepared by the polymerization of this O/W emulsion, followed by carbonization and activation process. As-prepared N-MMCFs were characterized by scanning electron microscopy, infrared (IR) spectra, N2adsorption and desorption analysis, and electrochemical workstation. The results indicate that the N-MMCFs have main macropore of 0.2μm, mesopore of 2.6–4.0nm and specific surface areas of 1205–1808m2g−1. The contact angle of N-MMCFs for water is about 37.5°, obviously lower than that of MMCFs (72.9°), which suggests that the surface wettability of N-MMCFs is greatly improved due to the incorporation of nitrogen into the carbon framework. Electrochemical measurements show that specific capacitance of a typical N-MMCF as electrode material in 6M KOH aqueous solution is as high as 198Fg−1at a current density of 1.0Ag−1. Its specific capacitance can still remain 159Fg−1at a high loading current density of 20.0Ag−1with the retention of 80.3%, which indicates that the typical N-MMCF as electrode material has a good rate capability. The high current charge and discharge capability offers the promising prospects for the application of N-MMCFs as electrode materials in supercapacitors which could meet the need of high power density.
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